) Include a method that will multiply by three every node of the tree: public void triple() { ... } For example, the tree

                               t =                        3
                                                        /        \
                                                        /        \
                                                      4             5
                                                 /        \       /        \
                                               6           7      8        9

after doing t.triple(); should become 9 / \ / \ 12 15 / \ / \ 18 21 24 27 print("code sample");